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Sift together the flour, salt and xanthan gum.
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Rub in the margarine until you get a breadcrumb consistency.
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Stir the egg yolk and herbs into the flour mix.
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With a round ended knife, gradually mix in the water until you reach a nice doughy consistency. You might need more or less than the 4 tbsp we used. The pastry needs to reach a stage where it doesn't crumble apart and also isn't too wet.
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Wrap in cling film and chill in the fridge for 15 mins or so before use.
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Roll out the pastry on a floured surface, if you find it sticks and crumbles too much this way, roll it between two pieces of cling film.
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Grease a 10in flan dish with some margarine and lay over the pastry, push the pastry into the sides and remove any overflowing bits with a knife.
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Cut a piece of baking parchment an inch or two bigger than the dish, place inside the pastry case and fill with baking beans or rice, place into a oven preheated to gas mark 5/190c and allow to blind back for 20-25 mins.
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While the pastry is in the oven, grill the bacon until the rind is nicely crispy and then cut into bitesized chunks and set aside, grate 150g of cheese into a bowl and set that aside too. Finish the filling preparation by beating the eggs and milk together in a jug or bowl.
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Once the pastry has finished blind baking, remove from the oven and remove the greaseproof paper/rice/beans. Place the bacon on the bottom of the pastry case, scatter over about 80% of the cheese, pour over the egg solution and finish off by scattering the remaining cheese on the top along with some mixed herbs.
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Place the quiche in the oven, again on gas mark 5/190c, allow to cook for 40-45 mins until the top is nice and golden and the egg is set.